Email Question

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This newsgroup may not be the best one for an email question, but I will
ask it anyway because 1) the people here are really smart and may know
the answer, and 2) the people here are really smart and may politely
suggest a better newsgroup.

A business friend has his own domain. All of his email is on a shared
POP server. When he sends an email to anyone with an email address under
his domain name, he gets the following bounced message:

The original message was received at Fri, 3 Mar 2006 16:44:38 -0500
from []

    ----- The following addresses had permanent fatal errors -----
     (reason: 575 rose@[domain].com sender requires authentication)

    ----- Transcript of session follows -----
... while talking to mail.[domain].com.:
<<< 575 rose@[domain].com sender requires authentication
554 5.0.0 Service unavailable

Please note the following:

1) The problem is not SMTP authentication, for two reasons: The ISP that
provides his Internet service does not require authentication, and we
have tried with and without.

2) He has no problem sending to anyone EXCEPT someone under his domain

3) Outlook 2003 passes the internal email test with no problem.

4) Anyone on the domain has the same problem.

5) He just changed the host for [domain].com, and both hosts exhibit the
same behavior.

In particular, does anyone know what error 575 is? I looked in the RFC,
but I was unable to find it.


Re: Email Question

mcp6453 wrote:
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It looks like his MTA (sendmail, exim, etc.) is set up incorrectly.
It's requiring authorization to send intra-domain email, which shouldn't
happen.  Time to start beating the host.

Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.

Re: Email Question

posted something that included:

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Actually the problem *IS* SMTP authentication. If your mail says it
comes from, the SMTP is refusing to handle the
mail unless it's authenticated.

Use the SMTP on the server to solve this problem.

Does RoadRunner block port 25 access? That's simple to solve. Port 25
was originally intended from server-to-server communications; port 587
was specified for the submission of mail. If you configure the SMTP on
the server to listen on port 587, and configure your email
client to use port 587, you can send ALL your mail using that domain
name in the "From" header through that SMTP server.

If you want to send out mail saying you're "" as
well, the server SMTP may or may not allow that.

I don't know if Outlook 2003 can be configured with multiple SMTP
servers. Pegasus allows that - and it's a considerably safer program
to use as well. If you need it, it's free, at

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I'm not sure, but I think it's an error code used only by EXIM.  Error
575 is "requires authentication".



Re: Email Question

Paul Ding wrote:
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Thanks Paul and Jerry. I will not pretend to understand everything you
said, but it does appear as if RoadRunner is the problem. We'll let them
sort it out Monday.

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